lp8765rlx National Semiconductor Corporation, lp8765rlx Datasheet - Page 22

• Manufacturer Part Number: lp8765rlx
• Description: High Performance Power Management Unit For Handset Applications
• Manufacturer: National Semiconductor Corporation

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INL
DNL
Unless otherwise noted, V
=0V, C
pearing in normal type apply for T
operation, T
Real-Time Clock
Real-time clock (RTC) block is used for time tracking in any
chip condition. It uses 32 kHz crystal oscillator for accurate
time predictions and is supplied either from system supply in
normal condition or from coin battery when the chip is in shut-
down mode.
This RTC has the following features:
•
•
•
All RTC data is presented in binary format, with following de-
tails:
•
•
•
•
•
RTC time and alarm registers are user-writable, except for
day-of-week registers, which are calculated automatically and
are read-only.
Symbol
Accurate time counting, with fine-grained correction for
inaccuracies caused by environment;
Calendar for years 2000 - 2099 with leap-year
compensation and automatic day-of-week calculation;
and
Two highly customizable alarms.
Seconds, minutes: codes from 000000 to 111011
represent numbers from 0 to 59;
Hours: codes from 00000 to 10111 represent numbers
from 0 to 23; only 24-hour mode available;
Days of week: codes from 000 to 110 represent days from
Monday to Sunday;
Days of month: codes from 00000 to 11110 represent days
from 1st to 31st; and
Years: codes from 0000000 to 1100011 represent years
from 2000 to 2099.
RTC TIME DAY OF MONTH Current RTC time: day of month (0x00...0x1E; 0x00 is the first day of the month)
VIN_CHG
RTC RESET SECONDS Write '1' to reset seconds value to 0
J
Resolution
Integral Nonlinearity
Differential Nonlinearity
Conversion Time
RTC TIME SECONDS Current RTC time: seconds (0x00...0x3B)
RTC TIME WEEKDAY
= −40°C to +125°C.
RTC TIME MINUTES Current RTC time: minutes (0x00...0x3B)
=C
RTC TIME MONTH
RTC TIME HOURS Current RTC time: hours (0x00...0x17)
VIN_B
RTC TIME YEAR Current RTC time: year (0x00...0x63 - years 2000...2099)
1=C
Parameter
BATT
VIN_B2
(=V
=C
J
VIN1
(Note
=25°C. Limits appearing in boldface type apply over the entire junction temperature range for
BUCK
Current RTC time: weekday (0x0...0x6; 0x0 - Monday, 0x1 - Tuesday, 0x2 - Wednesday, 0x3
- Thursday, 0x4 - Friday, 0x5 - Saturday, 0x6 - Sunday)
Current RTC time: month (0x0...0xB; 0x0 - January, 0x1 - February, 0x2 - March, 0x3 - April,
0x4 - May, 0x5 - June, 0x6 - July, 0x7 - August, 0x8 - September, 0x9 - October, 0xA -
November, 0xB - December)
=V
1=C
6)
VIN2
ADC ELECTRICAL CHARACTERISTICS
BUCK2
=V
(Note
No missing code
(Note
VIN3
RTC TIME SELECTION TABLE 1
= C
=V
7)
7)
VIN1
Registers 0x4C...0x51
VIN_B1
Conditions
=C
=V
VIN2
VIN_B2
(Note
=10 µF, C
22
) =3.7V, GND (=GND_B1=GND_B2=GND_LDO=GND_SINK)
Alarms allow creating periodical or one-time events. The re-
sult of an alarm event depends on the PMU state. If PMU is
in standby, then alarm causes PMU to start up. If PMU is in
working mode, then alarm creates an interrupt.
Alarm event happens if the alarm is activated (ALARM AC-
TIVATED bit is '1') and current RTC time matches the time in
alarm configuration time stored in the register. The smallest
alarm selection time unit is 1 minute, and the event always
happens on the first second of the minute. To exclude a time
unit value from matching check, all alarm configuration bits
for this value must be written to '1'. For example, to ignore
month number on alarm creation, the ALARM MONTH code
must be 1111. Alarm weekday bits must also be configured -
alarm event can only happen on selected weekdays. If week-
day is not important or not known, then all weekday bits
should be set to '1'.
If the user writes some data into RTC alarm registers, then
this data is stored inside RTC. This data will stay there as long
as RTC has power. Turning off the phone will not remove RTC
supply, so the alarms will still work and can trigger a phone
power-up.
RTC UNLOCK FUNCTION
If the Battery voltage is lower than 3.4V/3.5V, the RTC level
shifts will be disabled when AC adapter or USB cable is
plugged in. In order to unlock the RTC date, two control bits
in address 0x39, “RTC UNLOCK” & “RTC DATA LATCH” are
used by following sequence:
1.
2.
7)
LDOx
Write 04h to address 0x39h
Write 08h to address 0x39h
=C
VTRM
Typ
12
=C
COIN
=1μF. Typical values and limits ap-
Min
−4
−2
Limit
Max
80
4
2
Units
LSB
bits
µs